Warm soapy water ( I use Dawn dish liquid) and a weak solution of beach, I set the bottom in the bathtub and wash it really well, rinse well, I wipe the tops of my bators off in the same solution and rinse with a clean cloth, the wire racks and water trays too. Set in the sun all day long to help kill what's left of bacteria....works for me!

I have a spray bottle with bleach....be sure to leave the bleach on for at least a few minutes....the sun is good, but more bacteria may be introduced by wildlife....or a dog may eat! (don't ask how I know)